Study of the effect of bubbles on canola oil as insulation in breakdown voltage using a 220 VAC voltage source, with a frequency of 50 Hz. This experiment used two plane electrode system with a diameter of 40 mm and a distance between the two electrodes set at 2.5mm, using a plastic needle as a tool for injecting bubbles. There are three types of bubbles: single bubbles, string bubbles, and clu…